Magnetic properties and signatures of moment ordering in the triangular lattice antiferromagnet 
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Bordelon, Mitchell M.; Wang, Xiaoling; Pajerowski, Daniel M.; Banerjee, Arnab; Sherwin, Mark S.; Brown, Craig M.; Eldeeb, Mohamed S.; Petersen, Thorben; Hozoi, Liviu; Rößler, U.; Mourigal, Martin; Wilson, Stephen D.

doi:10.1103/physrevb.104.094421

Cited by 13 publications

(13 citation statements)

References 83 publications

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“…Of particular interest, our combined data establish that the newly discovered oxide member of the series RbCeO 2 possesses the strongest antiferromagnetic exchange field, hosts the strongest distortion to its local CeX 6 octahedra, and uniquely fails to order among known Ce-based rare-earth delafossites. We further demonstrate that the anomalous local mode identified in KCeO 2 [28], proposed to manifest as a long-lived vibronic mode, also appears across the entire RbCeX 2 series. The energy of this mode shifts downward with increasing mass of the anion oscillator, further linking this mode to an unconventional vibronic or dynamic Jahn-Teller state.…”

Section: Introductionmentioning

confidence: 55%

“…Recalling that Ce 3+ (4f 1 , L=3, S=1/2) possesses total angular momentum J=|L − S|=5/2, the J=5/2 manifold is ideally split into three CEF doublets according to Kramer's theorem. This suggests that, at maximum, only two intramultiplet excitations should be observed in the INS spectra and intermultiplet excitations to higher J-states (≈ 250 meV) are known to only occur at energies far above the window explored here [28].…”

Section: Crystalline Electric Field Analysismentioning

confidence: 68%

“…Rough estimation from the Curie-Weiss fits places the saturation magnetization of RbCeO2 at 0.71µB. [28], there is one extra mode than expected for trivalent Ce 3+ in the D 3d symmetry. Recalling that Ce 3+ (4f 1 , L=3, S=1/2) possesses total angular momentum J=|L − S|=5/2, the J=5/2 manifold is ideally split into three CEF doublets according to Kramer's theorem.…”

Section: Crystalline Electric Field Analysismentioning

confidence: 82%

“…The analysis of crystalline electric field (CEF) schemes of RbCeX 2 (X 2 : O 2 , S 2 , SeS, Se 2 , TeSe, Te 2 ) followed the procedure we performed for KCeO 2 [28]. These materials crystallize in the same crystal structure with trivalent Ce 3+ in a local D 3d environment.…”

Section: Crystalline Electric Field Analysismentioning

confidence: 99%

“…In contrast, their selenide counterparts exhibit nearly static, quasi-two dimensional correlations [26,27]. While the single-electron counterparts KCeO 2 and KCeS 2 both develop signs of magnetic ordering at low temperature [28,29], a system-atic study exploring ligand field effects for Ce 3+ ions in ARX 2 remains absent.…”

Section: Introductionmentioning

confidence: 99%

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Electronic and structural properties of RbCeX$_2$ (X$_2$: O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$)

Ortizy¹,

Bordelon²,

Bhattacharyya³

et al. 2022

Preprint

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Triangular lattice delafossite compounds built from magnetic lanthanide ions are a topic of recent interest due to their frustrated magnetism and realization of quantum disordered magnetic ground states. Here we report the evolution of the structure and electronic ground states of RbCeX2 compounds, built from a triangular lattice of Ce 3+ ions, upon varying their anion character (X2= O2, S2, SeS, Se2, TeSe, Te2). This includes the discovery of a new member of this series, RbCeO2, that seemingly realizes a quantum disordered ground state. Magnetization and susceptibility measurements reveal that all compounds manifest mean-field antiferromagnetic interactions and, with the exception of the oxide, possess a magnetic ordering transition below 1 K. The crystalline electric field level scheme is explored via neutron scattering and ab initio calculations to model the intramultiplet splitting of the J = 5/2 component. In addition to the two excited doublets expected from the J = 5/2 multiplet, we observe one extra, local mode present across the sample series. This added mode shifts downward in energy with increasing anion mass, suggesting a long-lived, vibronic state endemic to anion vibrations about the Ce 3+ moments.

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Section: Introductionmentioning

confidence: 55%

Section: Crystalline Electric Field Analysismentioning

confidence: 68%

Section: Crystalline Electric Field Analysismentioning

confidence: 82%

Section: Crystalline Electric Field Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electronic and structural properties of RbCeX$_2$ (X$_2$: O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$)

Ortizy¹,

Bordelon²,

Bhattacharyya³

et al. 2022

Preprint

Self Cite

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Synthesis, crystal structure and magnetic properties of KLnSe2 (Ln = La, Ce, Pr, Nd) structures: A family of 2D triangular lattice frustrated magnets

Sanjeewa

Xing

Taddei

et al. 2022

Journal of Solid State Chemistry

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The Shanghai alliance of multilingual researchers: Fudan University, Tongji University, Shanghai University of Finance and Economics, and Shanghai International Studies University, China

et al. 2022

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Patient-independent detection of epileptic activities based on visual spectral representation of continuous EEG (cEEG) has been widely used for diagnosing epilepsy. However, precise detection remains a considerable challenge due to subtle variabilities across subjects, channels and time points. Thus, capturing fine-grained, discriminative features of EEG patterns, which is associated with high-frequency textural information, is yet to be resolved. In this work, we propose Scattering Transformer (ScatterFormer), an invariant scattering transform-based hierarchical Transformer that specifically pays attention to subtle features. In particular, the disentangled frequency-aware attention (FAA) enables the Transformer to capture clinically informative high-frequency components, offering a novel clinical explainability based on visual encoding of multichannel EEG signals. Evaluations on two distinct tasks of epileptiform detection demonstrate the effectiveness our method. Our proposed model achieves median AUCROC and accuracy of 98.14%, 96.39% in patients with Rolandic epilepsy. On a neonatal seizure detection benchmark, it outperforms the state-of-the-art by 9% in terms of average AUCROC.

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Magnetic properties and signatures of moment ordering in the triangular lattice antiferromagnet KCeO2

Cited by 13 publications

References 83 publications

Electronic and structural properties of RbCeX$_2$ (X$_2$: O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$)

Electronic and structural properties of RbCeX$_2$ (X$_2$: O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$)

Synthesis, crystal structure and magnetic properties of KLnSe2 (Ln = La, Ce, Pr, Nd) structures: A family of 2D triangular lattice frustrated magnets

The Shanghai alliance of multilingual researchers: Fudan University, Tongji University, Shanghai University of Finance and Economics, and Shanghai International Studies University, China

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